Nalu Loc: Southern Arizona

Thinking of upgrading from the older version Canon 100-400 L-IS lens to either the newer version of this lens (II) or the new fixed 400 f4.0 DO. I have a 2X III extender that does not auto focus with the older 100-400, and am concerned about the speed with the 2XIII attached, but also am curious whether the new version will autofocus with the 2X attached.I assume the 2XIII will autofocus with the new 400MM fixed (corret?), and I like the differential in speed vs. the zoom. Price is of coarse significantly different for the fixed lens, however the reviews for the 100 - 400 are pretty good. Anyone with experience with the new zoom lens? Comments would be appreciated.

Willie496 Loc: South Dakota

Christopher Dodds Nature Photographer on facebook would be a good place to ask

SnappyHappy Loc: Chapin, SC “The Capitol of Lake Murray”

Your 2x extender will decrease your maximum aperture by 2 stops, a 1.4x extender will decrease maximum aperture by 1 stop. Canon's AF systems work with lenses of maximum aperture of f5.6 or faster. Using a f4 maximum aperture lens would allow you to AF with a 1.4x extender but not with the 2x. Hope this helps

Nalu Loc: Southern Arizona

meaning with the EF 400mm f/4 DO IS II USM, af would not work but the 1.4 x would, correct?

SnappyHappy Loc: Chapin, SC “The Capitol of Lake Murray”

Correct. Will with 1.4x, won't with 2x

Nalu Loc: Southern Arizona

thank you, this helps

speters Loc: Grangeville/Idaho

For one thing, the lens has nothing to do with autofocusing with the old, or the newer version, it's just about its largest aperture and the camera you're using. If you have a camera that has AF points capable of focusing down to f/8, than the slowest lens you can use is f/4, if using a 2x TC, no matter what lens! Using a 1.x TC will give you an extra stop, but if two lenses of the same kind (new or old) have the same apertures, it does not matter, only if your cameras AF can handle it matters!

SnappyHappy Loc: Chapin, SC “The Capitol of Lake Murray”

Glad to help

Nalu Loc: Southern Arizona

I'm using a D6, full frame.

SharpShooter Loc: NorCal

Nalu, welcome to the Hog.
The 400DO will focus with a 2x but only if you are using the 7ll, 5lll or 1Dx. Otherwise it will only focus with the 1.4x. ;-)
SS

speters Loc: Grangeville/Idaho

That entirely depends on which Canon camera you shoot with, some models do not AF with an f/4 lens and an 2x TC, and some do, so that's the only thing that matters in that regard.

SnappyHappy Loc: Chapin, SC “The Capitol of Lake Murray”

I shoot a 6D as well, the AF requires f5.6 or faster

SnappyHappy Loc: Chapin, SC “The Capitol of Lake Murray”

Wasn't aware any Canon focused below 5.6 max. I've learned something new too. Now I'm starting to have GAS

Basil Loc: New Mexico

Yep, that's one of the things I love about my new 7DM2 - it will AF (center point only) at f8!

oldtool2 Loc: South Jersey

This may help.

Lens Compatibility for Canon 2X III

EF 135mm f/2L USM - AF Possible -
EF 180mm f/3.5L Macro USM - AF Not Possible -
EF 200mm f/2.8L II USM - AF Possible -
EF 200mm f/2L IS USM - AF Possible - "With the EOS-1Ds Mark II, EOS-1Ds, EOS-1D Mark II N, EOS-1D Mark II, EOS-1D, EOS-1v, EOS 1v HS and EOS-3, AF is possible with the center focusing point only"
EF 300mm f/2.8L IS USM - AF Possible -
EF 300mm f/4L IS USM - AF Not Possible - With the EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1D Mark III, EOS-1D Mark II, EOS-1Ds, EOS-1D, EOS-1v and EOS-3, AF is possible with the center focusing point only. The Image Stabilizer does not operate with the following cameras: EOS650, 630, 620, 600, RT, 700, 750, 850, EOS-1, A2, A2E, 10s, ELAN, Rebel, Rebel S, Rebel II and Rebel SII.
EF 400mm f/2.8L IS USM - AF Possible -
EF 400mm f/4 DO IS USM - AF Not Possible - With the EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1D Mark III, EOS-1D Mark II, EOS-1Ds, EOS-1D, EOS-1v and EOS-3, AF is possible with the center focusing point only. The Image Stabilizer does not operate with the following cameras: EOS650, 630, 620, 600, RT, 700, 750, 850, EOS-1, A2, A2E, 10s, ELAN, Rebel, Rebel S, Rebel II and Rebel SII.
EF 400mm f/5.6L USM - AF Not Possible -
EF 500mm f/4L IS USM - AF Not Possible - With the EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1D Mark III, EOS-1D Mark II, EOS-1Ds, EOS-1D, EOS-1v and EOS-3, AF is possible with the center focusing point only. The Image Stabilizer does not operate with the following cameras: EOS650, 630, 620, 600, RT, 700, 750, 850, EOS-1, A2, A2E, 10s, ELAN, Rebel, Rebel S, Rebel II and Rebel SII.
EF 600mm f/4L IS USM - AF Not Possible - With the EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1D Mark III, EOS-1D Mark II, EOS-1Ds, EOS-1D, EOS-1v and EOS-3, AF is possible with the center focusing point only. The Image Stabilizer does not operate with the following cameras: EOS650, 630, 620, 600, RT, 700, 750, 850, EOS-1, A2, A2E, 10s, ELAN, Rebel, Rebel S, Rebel II and Rebel SII.
EF 800mm f/5.6L IS USM - AF Not Possible - "With the EOS-1Ds Mark II, EOS-1Ds, EOS-1D Mark II N, EOS-1D Mark II, EOS-1D, EOS-1v, EOS1v HS and EOS-3, AF is possible with the center focusing point only"
EF 1200mm f/5.6L USM - AF Not Possible -
EF 70-200mm f/2.8L IS USM - AF Possible - If the lens is attached to an EOS camera, having multiple focusing points and an Extender is attached to the lens, only the center focusing point will be useable for AF.
EF 70-200mm f/2.8L USM - AF Possible -
EF 70-200mm f/4L IS USM / USM - AF Not Possible - With the EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1D Mark III, EOS-1D Mark II, EOS-1Ds, EOS-1D, EOS-1v and EOS-3, AF is possible with the center focusing point only.
EF 100-400mm f/4.5-5.6L IS USM - AF Not Possible - The Image Stabilizer does not operate with the following cameras: EOS650, 630, 620, 600, RT, 700, 750, 850, EOS-1, A2, A2E, 10s, ELAN, Rebel, Rebel S, Rebel II and Rebel SII.

Jim D